Bruce does get his legs up into Vince on the shot. Bruce does that all the time. Bowen usually turns when he does it, in an effort to contest but also to turn and box out. The problem with that is that he gets his foot under the jump shooter and it can be a hazzard in the landing area. That is how Dirk Nowitzki injured Manu in the World Championships in Indy (Germany vs. Argentina). Bruce has gotten several players on that including Finley, Vince, Ray and even Kobe earlier this year took exception to it.
Bruce has to be careful with that, if he truly doesn't want to injure other players. There's nothing wrong with getting your legs into other guys for leverage (Malik is successful with that positioning and box-out technique). If he keeps stepping under guys rather than getting into their legs higher up, that's where he crosses the line. Bruce needs to be careful and not reckless. Mo Lucas, Oakley, Laimbeer, Karl, Mutombo, Fortson, and Howard have all gotten reps for reckless play. Bowen may be joining this list if he's not careful.